2000 Chevrolet Silverado 1500 Q&A
2000 Chevrolet Silverado 1500 Question: Engine knocking on start up
Is it a knock or a ticking sound, I see a main bearing repair sleeve available from fel-pro and a special tool also for that sleeve. The time to replace the oil pump is 5.4 hrs then another 1.5 hrs to replace the main bearings, If its a knock better off to repair it before it destroys the crankshaft journals. - hemicuda
if it's a ticking sound it's probabaly sticking lifters. Look for some products at the parts store. - David M
This is not likely to be a lifter. My 2000 with 5.3L does the same, and has for over a year (has 86K miles on it now). There is all kinds of info posted on the internet about it. Apparently there is a bore distortion or piston/cylinder clearance issue when the engine is cold (aggravated by the short pistons on the 5.3L), particularly after you get some miles on the engine, and what you're actually hearing is piston slap. The odd thing in my truck is that I hear it better in the cab than from outside. Don't know if that means it's on one or more of the rear cylinders, or just has to do with how the noise is transmitted through the structure. Annoying as hell, but short of a new engine there's not much that can be done. I think mine has gotten more noticeable in the last year - cold weather is the worst for it. GM naturally claims it will not be detrimental to engine life. I'm way out of warranty, so I'll drive her til she pukes one way or the other. Do an internet search on 2000 Silverado piston slap, you'll find a lot of people with similar experience. Apparently they did something in the '03 & newer models to get rid of this issue. - Mad Gomer
I have a 2000 Silverado LT 5.3 The noise is called "Piston Slap". I believe it caused by a bad design of the piston and piston rings where carbon is built up over time, especially after the engine was ran than turned off. It will be more noticeable when its colder outside. The only way to fix this is to pull the heads and soak the cylinders with a solvent. - DRBrown75
Try using a lucas oil additive it helped me alot with the engine noise and it only comes back right when the oil needs to be changed again. I think its called Lucas oil staibilzer. - Visitor
I was told that there is an o-ring on the oil pick-up tube that deteriorates and it takes a minute to get the oil pumping.Mine is worse in the cold weather.Would weather have an effect on piston slap? - Visitor
On cold mornings my engine knocks for 2-3 minutes.....Dealership says it is normal....it bugs me, and it only has 33K on the truck. I had a 98 Z71 for 180K with no knocking noise...is it normal?
my engine started toknock at start up, but after 1 minute it just stopped. the next 3 start ups were fine but after sitting all day it did it again . The oil level is fine
I have a 2002 Chevrolet Silverado when i sometime start up i hear a tapping noise about 30 to 45 seconds after the engine is running , the noise usually last a few seconds then it's gone the engin...